Redis

What is Redis

Redis, which stands for Remote Dictionary Server, is a fast, open-source, in-memory key-value data store for use as a database, cache, message broker, and queue. Redis able to deliver millions of requests with in sub-millisecond response times per second. This create a huge impact in game development, Financial services, IOT and Healthcare systems.
Mostly impact of Redis gone through the gaming for enable Real-time leader-boards, real time analytics, and Real-time chat/media streaming etc.
Redis is developed using c++ language so it is cross platform. Another feature of redis is it is a open source system.

Developer - Salvatore SanFilippo
Release – 2009 MAY 10

caching

Redis cloud Ables to interact with large audience, large database requests with in small response time. Actually, it is strange thing when we see it from normal sql databases.
This happened because of Cashing.
Caching is a process of storing data in Cache. Actually, cache is a memory that works as a ram that stores data temporary in a place which is able to access more quickly than hard drive.
According that it serves data faster than we think.

Redis VS Database systems

Unlike data bases such as sql redis stores data as key value pairs. This structure also able to read and write.

Store data in Redis

SET “Name” “John”
Name ---à Key
John ----à Value

Redis is No-SQL database it means redis don’t have tables/rows/columns/functions/procedures
According to that it doesn’t use any SELECT,UPDATE,DROP,DELETE statements. 

Redis

·         Open source in – memory data structure store which can be used as database and/or a cache and message broker
·         No-SQL key
·         Support multiple data Structures
·         Built in replication

Redis datatypes
  • ·         String
  • ·         Maps
  • ·         Sets
  • ·         Hashes
  • ·         Lists

SQL Data Types

  • ·         Numeric(int, decimal, float)
  • ·         DATE/Time
  • ·         String/Char
  • ·         Unicodes
  • ·         Binary


Advantages of Redis
Performance
 https://redis.io/

Simple and Flexible

This is happen because redis don’t use tables, rows so there is no select,update,delete functions. We use only read and write functions only.

Durable

Redis has option to write data on disk and data write options are configurable.
Redis is able to use as Cashing system or full fledged DB.

Language and platform support
https://redis.io/clients

As we can see all most all the programming languages are supports. So it is an one of main advantages of Redis.

Compatibility

Redis can used as 2nd database to make write and read requests, queries and transactions faster.


Master – slave Replication feature


In Redis we can use different instances of Redis . We can make any one as master and others as slaves.
In this case master can write only data store where as one of the slaves can used for read only and other slave s can used to write only data to disk syncronisely. So one of the slave can use for read and write and other slave is writing data to disk at the same time.



Redis Has Single text file for all configurations
Redis is single threaded – one action at a time.
It eliminates all the issue with lock waiting threads and all other issue threads.

Redis Clients






















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